5.5 Flashcards
(5 cards)
1
Q
fossil
A
Petrified remains of an organism or of traces left by an organism.
2
Q
rudimentary (vestigial) organ
A
An organ that has lost parts of its function over the course of a long time and hardly develops at all.
3
Q
geological timescale
A
Timescale showing the time since the Earth was formed.
4
Q
sediment
A
Layer of sand or clay particles.
5
Q
A
